Question

Which one directly transfers electrons to $NAD{P}^{+}$ during light reaction?

• A. PS I
• B. PS II
• C. Cytochromes
• D. Plastocyanin.

Answer 1

The correct option is A PS I

The light-dependent reactions start in photosystem II (PSII). When the pigment in the reaction centre of PS II i.e, P${}_{680}$ absorbs a photon, an electron in this molecule gets excited and transferred to a primary electron acceptor, Pheophytin and then go through molecules in a series of redox. The electron flow goes from PSII to cytochrome b6f complex than to PSI. In PSI, the electron is finally accepted by NADP. Thus photosystem I in light-dependent reaction directly transfers electrons to NADP.